: Terry....I have two Toto Drake model toilets in my homw that a purchased a couple years back because of your sires recommendation......BTW.....they are great. As of late .....both of them fill at an intermittent pace.....and make some sort of chirping noise.....it is definitely coming from the fill valve. Is there some sort of adjustment that can be made on these valves.....or is it time for a new one. Also....I am assuming that the Toto's have to use Toto parts. Ron,